Bend-shaping device

ABSTRACT

A bend-shaping device with a movable ram and a work table in which a tool holder is fixed both on the ram and on the work table and in which the tool holder fixed to the table has a bottom-die with two working positions with which a first tool, fixed directly in the tool holder of the ram, and a second tool, displaceably connected to the tool holder, coact interchangeably. The tool holder of said second tool is mounted on the tool holder of said first tool displacebly from the interposed position into an inoperative position approximately in the direction of withdrawal, while in the interposed position the second tool lies in the actuation path of said first tool and is pressed by this against the bottom die.

United States Patent Zbornik [451 Aug. 8, 1972 [54] BEND-SHAPING DEVICEInventor: Vaclav Zbornik, Ofiringen, Switzerland Assignee: Hammerle A/GMaschinenfabrik,

Zofingen, Switzerland Filed: Sept. 16, 1970 Appl. No.: 72,775

Foreign Application Priority Data Sept. 22, 1969 Austria ..A 8974/69 US.Cl ..72/389, 72/470 Int. Cl. ..B21j 13/02 Field of Search ..72/470, 469,471, 472, 473,

References Cited UNITED STATES PATENTS 5/1960 Felt ..72/406 3,509,7575/1970 Hanni ..72/414 Primary Examiner-Charles W. Lanham AssistantExaminer-Gene P. Crosby Attorney-Michael S. Striker [57] ABSTRACT Abend-shaping device with a movable ram and a work table in which a toolholder is fixed both on the ram and on the work table and in which thetool holder fixed to the table has a bottom-die with two workingpositions with which a first tool, fixed directly in the tool holder ofthe ram, and a second tool, displaceably connected to the tool holder,coact interchangeably. The tool holder of said second tool is mounted onthe tool holder of said first tool displacebly from the interposedposition into an inoperative position approximately in the direction ofwithdrawal, while in the interposed position the second tool lies in theactuation path of said first tool and ispressed by this against thebottom die.

6 Claim, 2 Drawing figures FATE NTED 8 I973 3.681, 99 4 sum 1 OF 2PATENTEDAus 81972 saw 2 er 2 FIGZ BEND-SHAPING DEVICE The invention isparticularly concerned with bendshaping apparatus of the kind in which aram is moveable relative to a work-table, on which can be mounted abottom-die, so that a tool supported in the tool-holder can be made bymovement of the ram to coact with a working position in the bottom-diesupported by the work-table.

Applicant previously developed bend-shaping apparatus of this kind, inwhich the bottom-die is provided with two separate working positions,with one of which coacts the tool supported in the tool-holder and isactuable directly thereby, while with the other working position of thebottom-die there coacts a second tool, supported in a second tool-holderpivotally mounted upon the first tool-holder about an axis perpendicularto the direction of movement of the ram, so that it can be moved from aninoperative position into anoperative position where it coacts with thesecond working position of the bottom-die.

This arrangement has shown much promise in various industrialoperations, especially where bend-shaping operations are to be carriedout in accordance with a pre-determined program. It is therefore thepurpose of the present invention to provide an improved bendshapingapparatus of this kind.

According to the present invention there is provided bend-shapingapparatus, comprising a work-table adapted to support a bottom-diehaving a first working position and at least one further workingposition, a ram moveable relative to said worktable, said ram beingprovided with a firsttool-holder adapted to support a first toolmoveable with the ram and actuable directly thereby to coact with thefirst working position of the bottom-die, and in which there is providedat least one secondary tool-holder mounted upon the first tool-holderand displaceable between operative and inoperative positions, saidsecondary tool-holder (s) being adapted to support a further toolmoveable with the ram and, when said secondary tool-holder is in itsoperative position, actuable indirectly thereby via a tool supported insaid first tool-holder to coact with a further working position of saidbottom-die, said secondary tool-holder(s) being displaceable from theoperative to the inoperative position partly laterally but mainly byretraction along substantially the direction of movement of said ram.

The secondary tool holder can advantageously be mounted for pivotalmovement about a pivot point fixedly mounted upon the first tool-holder,one end of the secondary tool-holder being adapted to support thefurther tool, while the first tool-holder interconnected with thesecondary tool-holder at or adjacent its other end via a double-actingpiston-and-cylinder assembly so as to permit the secondary tool-holderto be pivotted and thus the further tool to be shifted in and out of theoperative position laterally with respect to the direction of movementof the ram. In order to achieve retraction of the secondary tool-holderalong the direction of movement of the ram, the secondary tool-holdermay conveniently include a pivotally-mounted piston-andcylinder assemblydisposed substantially parallel to the direction of movement of saidrarn, at one end adapted to support said further tool and at or adjacentthe other end remote therefrom interconnected with said firsttool-holder.

Alternatively, the secondary tool-holder can also advantageously bemounted laterally of and substantially co-axially with the firsttool-holder, and can then be bodily displaced laterally relative to thefirst toolholder by means of at least one double-actingpistonand-cylinder assembly, and preferably two such assemblies, viawhich it is mounted thereon. Here again, in order to achieve retractionof the secondary toolholder along the line of movement of the ram thesecondary tool-holder can advantageously include a piston-and-cylinderassembly disposed substantially parallel to the direction of movement ofthe ram, at one end adapted to support the further tool, which thuspermits retraction thereof in substantially the direction of movement ofthe ram.

The bend-shaping apparatus preferably incorporates both a first toolsupported in the first tool-holder and at least one further toolsupported in at least one of the secondary. tool-holders, and the secondtool (5) desirably will have a cut-away portion, forming a step againstwhich (in the operative position of the second tool) the first toolabuts.

In one of the preferred embodiments the secondary tool-holder isconstructed as a two-armed lever supported intermediate its ends atpivot point fixedly secured to the first tool-holder, the further toolbeing supported at one end of the two-armed lever while the other,remote end of the secondary tool-holder is connected to the firsttool-holder by means of a reciprocable pivotting piston-andcylinderassembly.

In order that the invention may be well understood it will now befurther described, though only by way of illustration, with reference tothe accompanying drawings, in which:

FIG. 1 is a schematic representation, in elevation, of one preferredembodiment of the invention; and

FIG. 2 is a representation, similar to that of FIG. 1, of anotherembodiment of the invention.

Referring first to FIG. 1, it will be seen that a toolholder 1 extendsvertically downwards from the ram R of the bend-shaping apparatus.Supported upon the tool-holder 1 is an interchangeable bending tool 2.Beneath the ram, tool-holder 1 and tool 2 there is arranged a work-table3 which carries a tool-holder 4 which in turn supports a bottom-die 5,having two working positions indicated 6 and 7. The bending tool 2coacts with the working position 6, while a second tool 8 coacts withthe working position 7. The arrangement therefore is such that the tool8 can be shifted from the operative, interposed position shown into aninoperative position in which on the movement of the ram the bendingtool 2 becomes effective. The tool 8 includes a laterial, step-shapedrecess 9, in which the tool 2 is received in the operative, interposedposition of the tool 8, so that the pressure from the tool holder 1necessary for shaping is applied directly to the tool 8.

The tool 8 is mounted upon a piston rod 10, secured to a piston 1 1which fits within a double-acting working cylinder 12. The workingcylinder 12 is pivotally mounted upon the tool holder 1, the fixingposition being denoted by 13. The other end of the working cylinder 12remote from the tool 8 is connected pivotally to the tool holder 1 bymeans of a reciprocable piston-and-cylinder assembly comprising cylinder14 and piston 15 and piston rod 16. This reciprocable cylinder 14 isalso double-acting.

In the position shown, the piston is extended and consequently theworking cylinder 12 together with piston rod 10 are swung about pivotpoint 13 in such a way that tool 8 is inserted into the interposed,operative position. It will be seen that a two-armed lever is formed bypiston rod 10, piston 11 and working cylinder 12, this two-armed leverbeing pivotable about the fixing position 13. If the reciprocablecylinder 14 is retracted in the clockwise direction, then the workingcylinder 12 together with piston rod 10 can then subsequently beretracted upwards by means of the piston 11 in the working cylinder 12.In this way the tool 8 is completely removed from the path of movementof the bending tool 2, which can then be brought into operation.

Referring to the second embodiment of the invention shown in FIG. 2, itwill be noted that here for convenience similar parts are again denotedby the same reference numerals 'as in FIG. 1, and need not be furtherdescribed. However, in this embodiment the working cylinder 12 ismounted upon the tool-holder 1, both at the top and bottom of theformer, via respective double-acting piston-and-cylinder assemblies,designated 17 and 18. If the two piston-and-cylinder assemblies 17 and18 are actuated simultaneously the working cylinder 12 together withpiston rod 10 and tool 8 will be bodily displaced laterally whileremaining parallel to the tool-holder 1, so that the tool 8 is removedfrom the region of the bending tool 2, whereupon the latter can bebrought into operation.

What I claim is:

1. Bend-shaping apparatus, comprising a work-table adapted to support abottom-die having a first working position and at least one furtherworkingposition, a ram moveable relative to said work-table, said rambeing provided with a first tool-holder adapted to support a first toolmoveable with the ram and actuable directly thereby to coact with thefirst working position of the bottom-die, and in which there is providedat least one secondary tool-holder mounted upon the first tool-holderand displaceable between operative and inoperative positions, saidsecondary tool-holder being adapted to support a further tool moveablewith the ram and, when said secondary tool-holder is in its operativeposition, actuable indirectly thereby via a tool supported in said firsttool-holder to coact with a further working position of said bottom-die,said secondary tool-holder being displaceable from the operative to theinoperative position partly laterally but mainly by retraction insubstantially the direction of movement of said ram.

2. Bend-shaping apparatus according to claim 1, in which the secondarytool-holder is mounted for pivotal movement about a pivot point fixedlymounted upon the first tool-holder, one end of the secondary toolholderbeing adapted to support the further tool and the other end remotetherefrom being interconnected with the first tool-holder via adouble-acting pistonand-cylinder assembly so as to permit the furthertool to be shifted laterally in and out of the operative position in thedirection of movement of the ram.

3. Bend-shaping apparatus according to claim 2, in which the secondarytool-holder includes a pivotallymounted piston-and-cylinder assemblydisposed substantially parallel to the direction of movement of said?18a? 2n%ifil1?83$$J8Ri3 terconnected with said first tool-holder.

4. Bend-shaping apparatus according to claim 1, in which the secondarytool-holder is mounted laterally of and substantially parallel with thefirst tool-holder, and is bodily displaceable laterally relative to thefirst toolholder by means of at least one double-actingpistonand-cylinder assembly via which it is mounted thereon.

5. Bend-shaping apparatus according to claim 4, in which said secondarytool-holder includes a piston-v and-cylinder assembly disposedsubstantially parallel to the direction of movement of the ram, at oneend adapted to support the further tool, and thus permitting retractionthereof in substantially the direction of movement of the ram.

6. Bend-shaping apparatus according to claim 1, also incorporating afirst tool supported in said first toolholder and a further toolsupported in said secondary tool-holder, the second tool having acut-away portion forming a step against which, in the operative positionof the second tool, abuts the first tool.

1. Bend-shaping apparatus, comprising a work-table adapted to support abottom-die having a first working position and at least one furtherworking position, a ram moveable relative to said work-table, said rambeing provided with a first tool-holder adapted to support a first toolmoveable with the ram and actuable directly thereby to coact with thefirst working position of the bottom-die, and in which there is providedat least one secondary tool-holder mounted upon the first toolholder anddisplaceable between operative and inoperative positions, said secondarytool-holder being adapted to support a further tool moveable with theram and, when said secondary toolholder is in its operative position,actuable indirectly thereby via a tool supported in said firsttool-holder to coact with a further working position of said bottom-die,said secondary toolholder being displaceable from the operative to theinoperative position partly laterally but mainly by retraction insubstantially the direction of movement of said ram.
 2. Bend-shapingapparatus according to claim 1, in which the secondary tool-holder ismounted for pivotal movement about a pivot point fixedly mounted uponthe first tool-holder, one end of the secondary tool-holder beingadapted to support the further tool and the other end remote therefrombeing interconnected with the first tool-holder via a double-actingpiston-and-cylinder assembly so as to permit the further tool to beshifted laterally in and out of the operative position in the directionof movement of the ram.
 3. Bend-shaping apparatus according to claim 2,in which the secondary tool-holder includes a pivotally-mountedpiston-and-cylinder assembly disposed substantially parallel to thedirection of movement of said ram, at one end adapted to support saidfurther tool and at or adjacent the other end remote therefrominterconnected with said first tool-holder.
 4. Bend-shaping apparatusaccording to claim 1, in which the secondary tool-holder is mountedlaterally of and substantially parallel with the first tool-holder, andis bodily displaceable laterally relative to the first tool-holder bymeans of at least one double-acting piston-and-cylinder assembly viawhich it is mounted thereon.
 5. Bend-shaping apparatus according toclaim 4, in which said secondary tool-holder includes apiston-and-cylinder assembly disposed substantially parallel to thedirection of movement of the ram, at one end adapted to support thefurther tool, anD thus permitting retraction thereof in substantiallythe direction of movement of the ram.
 6. Bend-shaping apparatusaccording to claim 1, also incorporating a first tool supported in saidfirst tool-holder and a further tool supported in said secondarytool-holder, the second tool having a cut-away portion forming a stepagainst which, in the operative position of the second tool, abuts thefirst tool.